CN108091751B - White light LED device, preparation method thereof and LED lamp - Google Patents
White light LED device, preparation method thereof and LED lamp Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 172
- 239000003292 glue Substances 0.000 claims abstract description 97
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 81
- 238000000295 emission spectrum Methods 0.000 claims description 63
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 6
- 150000004645 aluminates Chemical class 0.000 claims description 6
- 238000004528 spin coating Methods 0.000 claims description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements
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Abstract
The invention discloses a white light LED device, a preparation method thereof and an LED lamp, wherein the white light LED device comprises: the fluorescent lamp comprises a bracket, a blue light emitting chip arranged on the bracket and fluorescent glue covering the blue light emitting chip; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion; the emission peak wavelength range of the blue fluorescent powder is 470nm-520 nm; the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm; the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm. The fluorescent glue is arranged to contain blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, has strong absorption effect on blue light emitted by the blue light emitting chip, achieves the effect of reducing the harm of the blue light, and simultaneously ensures that light emitted by the white light LED device has continuous light emitting spectrum.
Description
Technical Field
The embodiment of the invention relates to the technical field of LED packaging, in particular to a white light LED device, a preparation method thereof and an LED lamp.
Background
A Light Emitting Diode (LED) is a solid state semiconductor device that can directly convert electricity into Light. Because the LED does not contain mercury, has a small volume, a long service life, a fast reaction speed, environmental protection, energy saving, and high color saturation, it is more and more widely used, especially, the white LED is considered as a third generation illumination source following incandescent lamps and fluorescent lamps, and is widely used in liquid crystal projection devices, mobile phone backlights, display screens, and the like.
At present, there are various white light LED implementing technologies, and one of them is to generate white light by using a blue light LED chip in combination with yellow-green phosphor, or a blue light LED chip in combination with a mixed phosphor of yellow-green phosphor and red phosphor. That is, the blue light emitted by the blue LED chip excites the phosphor to emit yellow-green fluorescence, or excites the mixed phosphor to emit yellow-green and red mixed fluorescence, and the yellow-green light or the mixed fluorescence is combined with another part of the blue light transmitted through the phosphor to form white light.
However, the white light emitted by the white light LED generated in the scheme has discontinuous spectrum, the spectrum deletion phenomenon exists between 480 and 500nm, and the spectrum color rendering index is poor; in addition, in the prior art, the white light emitted by the white light LED has high blue light intensity, and is easy to cause blue light harm.
Disclosure of Invention
In view of this, embodiments of the present invention provide a white light LED device, a manufacturing method thereof, and an LED lamp, so as to solve the technical problems of a white light LED device in the prior art, such as a discontinuous spectrum and a large blue light intensity.
In a first aspect, an embodiment of the present invention provides a white light LED device, including a support, a blue light emitting chip disposed on the support, and a fluorescent glue covering the blue light emitting chip of the support; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;
wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;
the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;
the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm.
Optionally, in the color temperature range of 4700-; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 50% -70%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 600 to 780 nm.
Optionally, in the color temperature range of 3500-4700K, the proportion range of the energy intensity is 35% -70% in the wavelength range of 430nm-480 nm; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 40% -60%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; the proportion range of the energy intensity is 60-80% in the wavelength range of 600-780 nm.
Optionally, in the color temperature range of 2700-; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 35% -55%; the proportion range of the energy intensity is 40-60% in the wavelength range of 530-580 nm; the proportion range of the energy intensity is 70-95% in the wavelength range of 600-780 nm.
Optionally, in the color temperature range of 1600-2700K, the proportion range of the energy intensity is 10% -10% in the wavelength range of 430nm-480 nm; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 30% -50%; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 530nm to 580 nm; the proportion range of the energy intensity is 70-100% in the wavelength range of 600-780 nm.
Optionally, the blue fluorescent powder comprises at least one of nitrogen oxide system fluorescent powder, aluminate system fluorescent powder and silicate system fluorescent powder, the yellow-green fluorescent powder comprises at least one of aluminate system fluorescent powder, β -sialon system fluorescent powder and silicate system fluorescent powder, and the red fluorescent powder comprises at least one of nitride red powder, nitrogen oxide red powder and sulfide red powder.
Optionally, the dominant wavelength spectral range of the blue light emitting chip is 430nm to 480 nm.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing a white LED device, including:
providing a bracket;
arranging a blue light emitting chip on the bracket;
uniformly covering fluorescent glue on the blue light emitting chip of the bracket, wherein the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;
wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;
the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;
the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm.
Optionally, a fluorescent glue is uniformly covered on the blue light emitting chip of the bracket, and the blue light emitting chip is coated with the fluorescent glue; the fluorescent glue contains blue phosphor powder, yellow-green phosphor powder and red phosphor powder, blue phosphor powder, yellow-green phosphor powder and red phosphor powder according to the predetermined proportion evenly mix in the fluorescent glue, include:
uniformly mixing the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder with glue according to a preset proportion to form fluorescent glue;
uniformly preparing the fluorescent glue on one side of the bracket by adopting spraying, spin coating or a glue dispensing mode, wherein the blue light emitting chip is covered by the fluorescent glue;
and curing the fluorescent glue, wherein the blue light emitting chip is coated by the fluorescent glue.
In a third aspect, an embodiment of the present invention further provides an LED lamp, including the white light LED device according to the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the white light LED device and the preparation method thereof as well as the LED lamp provided by the embodiment of the invention, the fluorescent glue comprises the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder, the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to the preset proportion, the fluorescent glue has a strong absorption effect on the blue light emitted by the blue light emitting chip, the intensity of the light emitted by the blue light emitting chip in the whole spectrum is reduced, and the effect of reducing the harm of the blue light is achieved.
2. The embodiment of the invention provides a white light LED device, a preparation method thereof and an LED lamp, wherein fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion, and the fluorescent glue is excited by a blue light emitting chip to emit light, so that the light emitted by the white light LED device has a continuous light emitting spectrum, the phenomenon that the spectrum of the existing white light LED is lost between 480nm and 500nm is compensated, and the light emitted by the white light LED device has a strong color rendering index.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a white LED device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an excitation spectrum and an emission spectrum of a blue phosphor in a white LED device provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a comparison between a light emission spectrum of a white LED device provided by an embodiment of the present invention and a light emission spectrum of a white LED device in the prior art in a color temperature range of 4700K-6500K;
FIG. 4 is a schematic diagram illustrating comparison between the emission spectrum of the white LED device provided by the embodiment of the present invention and the emission spectrum of the white LED device in the prior art after normalization processing in the color temperature range of 4700K-6500K;
FIG. 5 is a schematic diagram of comparison between the light emission spectrum of a white LED device provided by an embodiment of the present invention and the light emission spectrum of a white LED device in the prior art at a color temperature range of 3500K-4700K;
FIG. 6 is a schematic diagram showing the comparison between the light emission spectrum of a white LED device provided by an embodiment of the present invention and the light emission spectrum of a white LED device in the prior art in the color temperature range of 2700K to 3500K;
FIG. 7 is a schematic diagram showing the comparison between the emission spectrum of a white LED device provided by an embodiment of the present invention and the emission spectrum of a white LED device in the prior art in the color temperature range of 1600K-2700K;
fig. 8 is a schematic flow chart of a method for manufacturing a white light LED device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
The white light LED device provided by the embodiment of the invention comprises a bracket, a blue light emitting chip arranged on the bracket and fluorescent glue covering the blue light emitting chip of the bracket; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion; wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm; the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm; the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm. By adopting the technical scheme, the fluorescent glue comprises the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to the preset proportion, so that the fluorescent glue is ensured to have stronger absorption effect on the blue light emitted by the blue light emitting chip, the intensity of the blue light emitted by the blue light emitting chip in the white light emitted by the whole white light LED device is reduced, and the effect of reducing the harm of the blue light is achieved. Meanwhile, the blue light emitting chip excites the fluorescent glue to emit light, so that the light emitted by the white light LED device has a continuous light emitting spectrum, the phenomenon that the spectrum emitted by the conventional white light LED is lost between 480nm and 500nm is compensated, and the light emitted by the white light LED device has a stronger color rendering index.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a white LED device according to an embodiment of the present invention, and as shown in fig. 1, the white LED device according to the embodiment of the present invention may include: the blue light emitting device comprises a bracket 10, a blue light emitting chip 20 arranged on the bracket 10 and fluorescent glue 30 covered on the blue light emitting chip 20 of the bracket 10; the fluorescent glue 30 comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue 30 according to a preset proportion;
wherein the emission peak wavelength range of the blue fluorescent powder is 470nm-520 nm;
the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;
the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm.
As shown in fig. 1, the embodiment of the present invention creatively proposes to include blue phosphor in the phosphor paste 30, specifically, the phosphor paste 30 includes blue phosphor, yellow-green phosphor and red phosphor, wherein, the emission peak wavelength range of the blue phosphor can be 470nm-520nm, the emission peak wavelength range of the yellow-green phosphor can be 520nm-560nm, the emission peak wavelength range of the red phosphor can be 600nm-680nm, the dominant wavelength spectrum range of the blue light emitting chip 20 can be 430nm-480nm, when stimulating the fluorescent glue 30 including above-mentioned mixed phosphor powder through using blue light emitting chip 20, blue phosphor powder can absorb blue light emitting chip 20 and see through the blue light that fluorescent glue 30 jetted out, guarantees that fluorescent glue 30 has stronger absorption to the blue light that blue light emitting chip 20 sent, reduces the intensity of the light that blue light emitting chip sent in whole spectrum. Meanwhile, the blue light emitting chip 20 provided by the embodiment of the invention can excite the blue fluorescent powder to have a stronger emission peak in the range of 480nm-520nm, and the emission peak can make up for the defect that the blue light of the emission spectrum of the existing white light LED is lost in the wave band, so that the spectrum generated by the white light LED device provided by the embodiment of the invention after laser is continuous from 430nm to 780nm, and the problem of spectrum loss of certain wave bands does not exist.
Specifically, as shown in fig. 2, fig. 2 is a schematic diagram of a laser spectrum and an emission spectrum of a blue phosphor in a white LED device provided by an embodiment of the present invention, where a curve 1 represents an excitation spectrum schematic diagram of the blue phosphor, and a curve 2 represents an emission spectrum schematic diagram of the blue phosphor. As can be seen from the schematic diagram of the excitation spectrum of the blue phosphor shown in curve 1 in fig. 2, the blue phosphor has a strong absorption effect in the wavelength range of 440nm to 460nm, and the peak wavelength exactly corresponds to the peak wavelength of the blue light emitting chip 20; the emission spectrum of the blue phosphor shown in curve 2 can be obtained by exciting the blue phosphor with the 430nm-480nm blue light emitting chip 20, and it can be known from curve 2 that the light emitting position of the blue phosphor corresponds to 460nm-540 nm. Therefore, as can be seen from the schematic diagram of the excitation spectrum and the emission spectrum of the blue phosphor shown in fig. 2, the blue phosphor is added to the phosphor glue 30, so that on one hand, the blue light emitted by the blue light emitting chip 20 can be absorbed, and the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the whole white light LED device is reduced, thereby reducing the harm of the blue light; on the other hand, the blue light emitting chip excites the blue fluorescent powder to emit 480nm-520nm blue light, so that the defect of the blue light emitting chip 20 at the section is compensated, and the color development effect of the white light LED device is integrally improved.
Optionally, because the light-emitting efficiency of the fluorescent powder with different colors is different under the condition of different color temperatures, the embodiment of the invention does not limit the proportional relation among the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder, the fluorescent powder with various colors only needs to satisfy the light-emitting wavelength range, and the mixed fluorescent glue can absorb the blue light emitted by the blue light-emitting chip 20, reduce the intensity of the blue light emitted by the blue light-emitting chip 20 in the white light emitted by the whole white light LED device, and ensure the spectrum continuity of the white light LED device.
Optionally, the blue phosphor may include at least one of oxynitride system phosphor, aluminate system phosphor and silicate system phosphor, the yellow-green phosphor may include at least one of aluminate system phosphor, β -sialon system phosphor and silicate system phosphor, and the red phosphor may include at least one of nitride red, oxynitride red and sulfide red.
Optionally, the dominant wavelength spectrum range of the blue light emitting chip 20 provided by the embodiment of the present invention may be 430nm to 480nm, which may be a spectrum of a single band, for example, a spectrum of a single band whose dominant wavelength spectrum range is 430nm to 480 nm; the spectrum of the two or more wavelength bands may also be obtained by mixing spectra of two or more wavelength bands, for example, spectra of two wavelength bands with dominant wavelength spectral ranges of 430nm to 450nm and 450nm to 480nm, which is not limited in the embodiment of the present invention.
Optionally, with continued reference to fig. 1, the blue light emitting chip 20 provided in the embodiment of the present invention may be a flip chip or a front chip; also, the stand 10 includes an electrical connection portion (not shown in the drawings) on the stand 10. When the blue light emitting chip 20 is a flip chip, the blue light emitting chip 20 is directly electrically connected with the electrical connection portion on the bracket 10, so as to obtain a voltage signal provided by the electrical connection portion and drive the blue light emitting chip 20 to emit light; when the blue light emitting chip 20 is a normal chip, the blue light emitting chip 20 needs to be electrically connected to the electrical connection portion of the bracket 10 by wire bonding, so as to obtain a voltage signal provided by the electrical connection portion and drive the blue light emitting chip 20 to emit light. Optionally, when the blue light emitting chip 20 is a normal chip and needs to be electrically connected to the electrical connection portion on the bracket by a wire bonding method, the blue light emitting chip may be electrically connected by one bonding wire or two bonding wires, which is not limited in the embodiment of the present invention. Fig. 1 illustrates only the blue light emitting chip 20 as a front mounted chip, and the blue light emitting chip 20 is electrically connected to the electrical connection portion on the support 10 through two bonding wires 40. With continued reference to fig. 1, the white LED device provided in the embodiment of the present invention may further include an insulating block 50 located in the support 10, where the insulating block 50 is used to separate the anode and the cathode, so as to ensure that the blue light emitting chip 20 emits light normally.
The following description explains in detail the beneficial effects of the white light LED device provided by the embodiment of the present invention compared with the white light LED device in the prior art from a schematic comparison of the emission spectrum of the white light LED device provided by the embodiment of the present invention and the emission spectrum of the white light LED device in the prior art under the condition of different color temperatures.
Fig. 3 is a schematic diagram illustrating a comparison between a light emission spectrum of a white LED device provided in an embodiment of the present invention and a light emission spectrum of a white LED device in the prior art in a color temperature range of 4700K to 6500K, where a curve 3 represents an absolute light emission spectrum of the white LED device provided in the embodiment of the present invention, and a curve 4 represents an absolute light emission spectrum of the white LED device in the prior art. As shown in fig. 3, in the spectral range 430nm to 480nm of the blue light emitting chip 20, the light emitting intensity of the blue light in the curve 3 is smaller than the light emitting intensity of the blue light in the curve 4, and specifically may be in the spectral range 430nm to 480nm, the blue light emitting intensity of the white light LED provided by the embodiment of the present invention is about 60% of the blue light emitting intensity of the white light LED in the prior art, so that the light emitting intensity of the blue light emitted by the blue light emitting chip 20 in the whole spectrum is greatly reduced, and the blue light hazard is reduced. The problems of high blue light intensity and serious blue light pollution in the conventional white light LED device are solved.
Fig. 4 is a comparison diagram of a normalized emission spectrum of the white light LED device provided by the embodiment of the present invention and an emission spectrum of the white light LED device in the prior art in a color temperature range of 4700K to 6500K, where a curve 6 represents a normalized emission spectrum of the white light LED device provided by the embodiment of the present invention, and a curve 7 represents a normalized emission spectrum of the white light LED device in the prior art. As shown in fig. 4, the light emission spectrum of the white light LED device provided by the embodiment of the present invention has a strong emission peak in the range of 480nm to 520nm, and the emission peak can make up for the defect that blue light in the wavelength band of the light emission spectrum of the existing white light LED device is missing, so that the spectrum generated after the white light LED device provided by the embodiment of the present invention is continuously from 430nm to 780nm, and the problem of missing of spectra in certain wavelength bands does not exist. Meanwhile, the continuous light-emitting spectrum can also realize good color development effect.
Optionally, with continuing reference to fig. 3, a curve 5 in fig. 3 represents a spectrum schematic diagram of saturated blue, and it can be known from the diagram that the light emission spectrum of the white light LED device provided by the embodiment of the present invention is close to the spectrum of saturated blue, and a strong emission peak exists around 480nm, so that the white light LED device provided by the embodiment of the present invention can make up for the technical problem of loss of saturated blue, and solve the defect that light emitted by the existing white light LED device has loss of brightness of saturated blue.
Optionally, the color rendering indexes R1-R15 of the white LED device provided by the embodiment of the present invention are all greater than 90, and are less different from the color under natural illumination, and the color rendering effect is good.
Optionally, in the color temperature range of 4700K to 6500K, the proportion range of the blue phosphor in the fluorescent glue 30 is 5% to 15%, the proportion range of the yellow-green phosphor is 80% to 90%, and the proportion range of the red phosphor is 1% to 6%. In the color temperature range of 4700K-6500K, the proportion range of the blue fluorescent powder is set to be 5% -15%, the proportion range of the yellow-green fluorescent powder is set to be 80% -90%, and the proportion range of the red fluorescent powder is set to be 1% -6%, so that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the whole white light LED device is reduced, the white light LED device is ensured to emit continuous spectrum, and the spectrum color rendering effect is good.
It is understood that% provided by the embodiments of the present invention refers to mass percentage.
It should be noted that fig. 3 only illustrates one emission spectrum of the white LED device in the color temperature range of 4700K to 6500K, and it can be understood that there are multiple possible emission spectra of the white LED device in the color temperature range of 4700K to 6500K, and table 1 illustrates the energy intensities of the emission spectra in different wavelength ranges and the preferred energy intensity.
TABLE 14700K-6500K color temperature range energy intensity distribution table for white LED device in different wavelength ranges
| Wavelength range (nm) | Intensity of energy | Preferred energy intensity |
| 430-480 | 70％-120％ | 80％-110％ |
| 480-520 | 50％-70％ | 55％-65％ |
| 530-580 | 45％-65％ | 50％-60％ |
| 600-780 | 50％-70％ | 55K-65％ |
It is understood that, in the color temperature range of 4700K to 6500K, when the energy range of the white light emitted from the white LED device is within the energy intensity range described in table 1, which is to be noted that the energy intensity described in the above table represents the absolute energy value of the light emission spectrum, the four independent wavelength ranges can be increased in the same proportion due to the difference of the measurement system.
Fig. 5 is a schematic diagram illustrating a comparison between a light emission spectrum of a white light LED device provided by an embodiment of the present invention and a light emission spectrum of a white light LED device in the prior art in a color temperature range of 3500K-4700K, where a curve 8 represents an absolute light emission spectrum of the white light LED device provided by the embodiment of the present invention, and a curve 9 represents an absolute light emission spectrum of the white light LED device in the prior art. As shown in fig. 5, in the spectral range 430nm to 480nm of the blue light emitting chip 20, the light emitting intensity of the blue light in the curve 8 is smaller than that of the blue light in the curve 9, so that the light emitting intensity of the blue light emitted by the blue light emitting chip 20 in the whole spectrum is greatly reduced, and the harm of the blue light is reduced. Meanwhile, the light-emitting spectrum of the white light LED device provided by the embodiment of the invention has a stronger emission peak in the range of 480nm-520nm, and the emission peak can make up the defect that the blue light of the light-emitting spectrum of the existing white light LED is lost in the wave band, so that the spectrum generated by the white light LED device provided by the embodiment of the invention after laser is continuous from 430nm to 780nm, and the problem of certain wave band spectrum loss is avoided. Meanwhile, the continuous light-emitting spectrum can also realize good color development effect.
Optionally, in the color temperature range of 3500K-4700K, the proportion range of the blue phosphor in the phosphor glue 30 is 10% -20%, the proportion range of the yellow-green phosphor is 75% -90%, and the proportion range of the red phosphor is 3% -8%. In a color temperature range of 3500K-4700K, the proportion range of the blue fluorescent powder is 10% -20%, the proportion range of the yellow-green fluorescent powder is 75% -90%, and the proportion range of the red fluorescent powder is 3% -8%, so that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the whole white light LED device is reduced, the white light LED device is ensured to emit continuous spectrum, and the spectrum color rendering effect is good.
It should be noted that fig. 5 only illustrates one emission spectrum of the white light LED device provided by the embodiment of the present invention in the color temperature range of 3500K-4700K, it can be understood that there may be a plurality of possible emission spectra of the white light LED device provided by the embodiment of the present invention in the color temperature range of 3500K-4700K, and table 2 illustrates the energy intensity of the emission spectrum in different wavelength ranges and the preferred energy intensity.
Energy intensity distribution table of white light LED device in different wavelength ranges under color temperature ranges of 23500K-4700K
It is understood that, in the color temperature range of 3500K-4700K, when the energy range of the white light emitted from the white LED device is within the energy intensity range described in table 2, all fall within the protection range of the embodiments of the present invention, it should be noted that the energy intensity described in the above table represents the absolute energy value of the light emission spectrum, and due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.
Fig. 6 is a schematic diagram illustrating a comparison between a light emission spectrum of a white LED device provided in an embodiment of the present invention and a light emission spectrum of a white LED device in the prior art in a color temperature range from 2700K to 3500K, where a curve 10 represents an absolute light emission spectrum of the white LED device provided in the embodiment of the present invention, and a curve 11 represents an absolute light emission spectrum of the white LED device in the prior art. As shown in fig. 6, in the spectral range 430nm to 480nm of the blue light emitting chip 20, the light emitting intensity of the blue light in the curve 10 is smaller than that of the blue light in the curve 11, so that the light emitting intensity of the blue light emitted by the blue light emitting chip 20 in the whole spectrum can be reduced, and the harm of the blue light is reduced. Meanwhile, the light-emitting spectrum of the white light LED device provided by the embodiment of the invention has an emission peak in the range of 480nm-520nm, and the emission peak can make up for the defect that the blue light of the light-emitting spectrum of the existing white light LED is lost in the wave band, so that the light spectrum generated by the white light LED device provided by the embodiment of the invention after laser is continuous from 430nm to 780nm, and the problem of certain wave band spectrum loss is avoided. Meanwhile, the continuous light-emitting spectrum can also realize good color development effect.
Optionally, in the color temperature range of 2700K to 3500K, the proportion range of the blue phosphor in the phosphor 30 is 12% to 22%, the proportion range of the yellow-green phosphor is 70% to 80%, and the proportion range of the red phosphor is 5% to 11%. In the color temperature range of 2700K to 3500K, the proportion range of the blue fluorescent powder is 12% to 22%, the proportion range of the yellow-green fluorescent powder is 70% to 80%, and the proportion range of the red fluorescent powder is 5% to 11%, so that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the whole white light LED device is reduced, the white light LED device is ensured to emit continuous spectrum, and the spectrum color rendering effect is good.
It should be noted that fig. 6 only illustrates an emission spectrum of the white LED device provided in the embodiment of the present invention in the color temperature range of 2700K to 3500K, and it can be understood that there may be a plurality of possible emission spectra of the white LED device provided in the embodiment of the present invention in the color temperature range of 2700K to 3500K, and table 3 illustrates the energy intensities of the emission spectra in different wavelength ranges and the preferred energy intensities.
Energy intensity distribution table of white light LED device in different wavelength ranges under table 32700K-3500K color temperature range
| Wavelength range (nm) | Intensity of energy | Preferred energy intensity |
| 430-480 | 20％-40％ | 25％-35％ |
| 480-520 | 35％-55％ | 40％-50％ |
| 530-580 | 40％-60％ | 45％-55％ |
| 600-780 | 70％-95％ | 75％-85％ |
It is understood that, in the color temperature range of 2700K to 3500K, when the energy range of the white light emitted from the white LED device is within the energy intensity range described in table 3, all fall within the protection scope of the embodiments of the present invention, it should be noted that the energy intensity described in the above table represents the absolute energy value of the light emission spectrum, and due to the difference of the measurement system, the above four independent wavelength ranges can be increased in the same proportion.
Fig. 7 is a schematic diagram illustrating a comparison between a light emission spectrum of a white LED device provided by an embodiment of the present invention and a light emission spectrum of a white LED device in the prior art in a color temperature range from 1600K to 2700K, where a curve 12 represents an absolute light emission spectrum of the white LED device provided by the embodiment of the present invention, and a curve 13 represents an absolute light emission spectrum of the white LED device in the prior art. As shown in fig. 7, at the spectrum center position 450nm of the blue light emitting chip 20, the light emitting intensity of the blue light in the curve 12 is smaller than that of the blue light in the curve 13, so that the light emitting intensity of the blue light emitted by the blue light emitting chip 20 in the whole spectrum can be reduced, and the harm of the blue light is reduced. Meanwhile, the light-emitting spectrum of the white light LED device provided by the embodiment of the invention has an emission peak in the range of 480nm-520nm, and the emission peak can make up for the defect that the blue light of the light-emitting spectrum of the existing white light LED is lost in the wave band, so that the light spectrum generated by the white light LED device provided by the embodiment of the invention after laser is continuous from 430nm to 780nm, and the problem of certain wave band spectrum loss is avoided. Meanwhile, the continuous light-emitting spectrum can also realize good color development effect.
Optionally, in the color temperature range of 1600K to 2700K, the proportion range of the blue phosphor in the phosphor glue 30 is 14% to 24%, the proportion range of the yellow-green phosphor is 70% to 80%, and the proportion range of the red phosphor is 8% to 14%. In the color temperature range of 1600-2700K, the proportion range of the blue fluorescent powder is set to be 14-24%, the proportion range of the yellow-green fluorescent powder is set to be 70-80%, and the proportion range of the red fluorescent powder is set to be 6-14%, so that the fluorescent glue 30 formed after mixing can absorb the blue light emitted by the blue light emitting chip 20, the intensity of the blue light emitted by the blue light emitting chip 20 in the white light emitted by the whole white light LED device is reduced, the white light LED device is ensured to emit continuous spectrum, and the spectrum color rendering effect is good.
It should be noted that fig. 7 illustrates only one emission spectrum of the white LED device provided by the embodiment of the present invention in the color temperature range from 1600K to 2700K, it is understood that there may be a plurality of possible emission spectra in the color temperature range from 1600K to 2700K in the white LED device provided by the embodiment of the present invention, and table 4 illustrates the energy intensity of the emission spectrum in different wavelength ranges and the preferred energy intensity.
TABLE 41600K-2700K color temperature range energy intensity distribution table for white LED devices in different wavelength ranges
It is understood that in the color temperature range of 1600K-2700K, when the energy range of the white light emitted from the white LED device is within the energy intensity range described in table 4, which falls within the protection scope of the embodiments of the present invention, it should be noted that the energy intensity described in the above table represents the absolute energy value of the light emission spectrum, and the four independent wavelength ranges can be increased in the same proportion due to the difference of the measurement system.
Optionally, fig. 8 is a schematic flow chart of a method for manufacturing a white light LED device according to an embodiment of the present invention, and the embodiment of the present invention further provides a method for manufacturing a white light LED device, which is used for manufacturing the white light LED device according to the embodiment of the present invention, and as shown in fig. 8, the method for manufacturing a white light LED device according to the embodiment of the present invention may include:
and S110, providing a bracket.
And S120, arranging a blue light emitting chip on the support.
Optionally, the blue light emitting chip may be a flip chip or a normal chip, and when the blue light emitting chip is a flip chip, the blue light emitting chip is directly electrically connected to the electrical connection portion on the support, so as to obtain a voltage signal provided by the electrical connection portion and drive the blue light emitting chip to emit light; when the blue light emitting chip is a normally installed chip, the blue light emitting chip needs to be electrically connected with an electric connection part on the support in a routing mode, a voltage signal provided by the electric connection part is obtained, and the blue light emitting chip is driven to emit light. Optionally, when the blue light emitting chip is a normal chip and needs to be electrically connected to the electrical connection portion on the support in a routing manner, the blue light emitting chip may be electrically connected through one bonding wire or two bonding wires, which is not limited in the embodiment of the present invention.
S130, uniformly covering fluorescent glue on the blue light emitting chip of the support, wherein the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion.
Exemplarily, fluorescent glue is uniformly covered on a blue light emitting chip of a support, the blue light emitting chip is coated by the fluorescent glue, and blue light emitted by the blue light emitting chip excites fluorescent powder in the fluorescent glue to emit light. Optionally, the emission peak wavelength range of the blue phosphor is 470nm to 520 nm; the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm; the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm.
According to the preparation method of the white light LED device provided by the embodiment of the invention, the blue light emitting chip is covered by the fluorescent glue which comprises the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder, so that the fluorescent glue has a strong absorption effect on the blue light emitted by the blue light emitting chip, the intensity of the blue light emitted by the blue light emitting chip in the white light emitted by the whole white light LED device is reduced, and the effect of reducing the harm of the blue light is achieved. Meanwhile, the blue light emitting chip excites the fluorescent glue to emit light, so that the light emitted by the white light LED device has a continuous light emitting spectrum, the phenomenon that the spectrum emitted by the conventional white light LED is lost between 480nm and 500nm is compensated, and the light emitted by the white light LED device has a stronger color rendering index.
Optionally, a fluorescent glue is uniformly covered on the blue light emitting chip of the bracket, and the blue light emitting chip is coated with the fluorescent glue; the fluorescent glue contains blue phosphor powder, yellow-green phosphor powder and red phosphor powder, blue phosphor powder, yellow-green phosphor powder and red phosphor powder according to the predetermined proportion evenly mix in the fluorescent glue, include:
uniformly mixing the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder with glue according to a preset proportion to form fluorescent glue;
uniformly preparing the fluorescent glue on one side of the bracket by adopting spraying, spin coating or a glue dispensing mode, wherein the blue light emitting chip is covered by the fluorescent glue;
and curing the fluorescent glue, wherein the blue light emitting chip is coated by the fluorescent glue.
Illustratively, blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder are uniformly mixed with glue according to a preset proportion, after fluorescent glue is formed, centrifugal defoaming treatment can be further performed on the fluorescent glue, bubbles in fluorescent glue liquid crystal are removed, the mixed fluorescent glue is uniformly prepared inside the bracket through spraying, spin coating or dispensing, the fluorescent glue can be kept still for a period of time, then the bracket is placed in an oven to be hardened, the fluorescent glue is solidified, and the blue light emitting chip is covered by the fluorescent glue.
Optionally, an embodiment of the present invention further provides an LED lamp, including the LED device according to the above embodiment of the present invention, which has the beneficial effects of the LED device, and details are not repeated here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A white LED device, comprising: the LED lamp comprises a bracket, a blue light emitting chip arranged on the bracket and fluorescent glue covering the blue light emitting chip of the bracket; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;
wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;
the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;
the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm;
the excitation peak wavelength of the blue fluorescent powder corresponds to the peak wavelength of the blue light emitting chip;
in the color temperature range of 3500K-4700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 35% -70%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 40% -60%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 60% -80%; in a color temperature range of 3500K-4700K, in a light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;
in the color temperature range of 2700K-3500K, in the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 20% -40%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 35% -55%; the proportion range of the energy intensity is 40-60% in the wavelength range of 530-580 nm; the proportion range of the energy intensity is 70-95% in the wavelength range of 600-780 nm; in the color temperature range of 2700K-3500K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;
in the color temperature range of 1600K-2700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 10% -10%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 30% -50%; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 530nm to 580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 70% -100%; and in the color temperature range of 1600K-2700K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder.
2. The white LED device of claim 1, wherein the proportion of energy intensity in the wavelength range of 430nm to 480nm is in the range of 70% to 120% in the range of color temperature of 4700K to 6500K; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 50% -70%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 600 to 780 nm.
3. The white LED device according to claim 1, wherein the blue phosphor comprises at least one of a nitrogen oxide phosphor, an aluminate phosphor and a silicate phosphor, the yellow-green phosphor comprises at least one of an aluminate phosphor, an β -sialon phosphor and a silicate phosphor, and the red phosphor comprises at least one of a nitride red, a nitrogen oxide red and a sulfide red.
4. The white LED device of claim 1, wherein the blue light emitting chip has a dominant wavelength in the spectral range of 430nm to 480 nm.
5. A preparation method of a white light LED device is characterized by comprising the following steps:
providing a bracket;
arranging a blue light emitting chip on the bracket;
uniformly covering fluorescent glue on the blue light emitting chip of the bracket, wherein the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue comprises blue fluorescent powder, yellow-green fluorescent powder and red fluorescent powder, and the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder are uniformly mixed in the fluorescent glue according to a preset proportion;
wherein the emission peak wavelength range of the blue fluorescent powder is 470-520 nm;
the wavelength range of the emission peak value of the yellow-green fluorescent powder is 520nm-560 nm;
the emission peak wavelength range of the red fluorescent powder is 600nm-680 nm;
in the color temperature range of 3500K-4700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 35% -70%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 40% -60%; the proportion range of the energy intensity is 45-65% in the wavelength range of 530nm-580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 60% -80%; in a color temperature range of 3500K-4700K, in a light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;
in the color temperature range of 2700K-3500K, in the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 20% -40%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 35% -55%; the proportion range of the energy intensity is 40-60% in the wavelength range of 530-580 nm; the proportion range of the energy intensity is 70-95% in the wavelength range of 600-780 nm; in the color temperature range of 2700K-3500K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder;
in the color temperature range of 1600K-2700K and the wavelength range of 430nm-480nm, the proportion range of the energy intensity is 10% -10%; in the wavelength range of 480nm-520nm, the proportion range of the energy intensity is 30% -50%; the proportion range of the energy intensity is 50 to 70 percent within the wavelength range of 530nm to 580 nm; in the wavelength range of 600nm-780nm, the proportion range of the energy intensity is 70% -100%; and in the color temperature range of 1600K-2700K, in the light emission spectrum of the white light LED device, the peak value of the light emission intensity of the blue light emitting chip is smaller than the light emission intensity of the yellow-green fluorescent powder and the light emission intensity of the red fluorescent powder.
6. The method for manufacturing a white light LED device according to claim 5, wherein a fluorescent glue is uniformly coated on the blue light emitting chip of the support, and the blue light emitting chip is coated by the fluorescent glue; the fluorescent glue contains blue phosphor powder, yellow-green phosphor powder and red phosphor powder, blue phosphor powder, yellow-green phosphor powder and red phosphor powder according to the predetermined proportion evenly mix in the fluorescent glue, include:
uniformly mixing the blue fluorescent powder, the yellow-green fluorescent powder and the red fluorescent powder with glue according to a preset proportion to form fluorescent glue;
uniformly preparing the fluorescent glue on one side of the bracket by adopting spraying, spin coating or a glue dispensing mode, wherein the blue light emitting chip is covered by the fluorescent glue;
and curing the fluorescent glue, wherein the blue light emitting chip is coated by the fluorescent glue.
7. An LED lamp comprising the white LED device of any one of claims 1 to 4.
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| CN201711277599.3A CN108091751B (en) | 2017-12-06 | 2017-12-06 | White light LED device, preparation method thereof and LED lamp |
| PCT/CN2018/118582 WO2019109867A1 (en) | 2017-12-06 | 2018-11-30 | White led device and manufacturing method thereof, and led lamp |
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| CN108091751B (en) * | 2017-12-06 | 2020-02-18 | 佛山市国星光电股份有限公司 | White light LED device, preparation method thereof and LED lamp |
| CN108922957A (en) * | 2018-06-27 | 2018-11-30 | 朗昭创新控股（深圳）有限公司 | Fluorescent glue, fluorescent film and preparation method thereof |
| CN110867436A (en) * | 2018-08-27 | 2020-03-06 | 成都东旭智能科技有限公司 | LED light source and LED lamp |
| CN109119411A (en) * | 2018-09-04 | 2019-01-01 | 易美芯光（北京）科技有限公司 | A kind of LED light source of multi-wavelength chip portfolio excitation |
| CN110970541B (en) * | 2018-09-29 | 2023-04-21 | 有研稀土新材料股份有限公司 | Semiconductor light source and optical device prepared by same |
| CN109638146B (en) * | 2018-12-13 | 2020-08-18 | 安徽芯瑞达科技股份有限公司 | LED light source for reducing blue light harm based on excitation of purple light chip |
| CN109935677B (en) * | 2019-04-01 | 2021-01-15 | 南京航空航天大学 | Fluorescent film structure for white light LED and preparation method thereof |
| CN110094641B (en) * | 2019-04-29 | 2020-07-21 | 佛山市国星光电股份有限公司 | White light L ED lamp pearl and lamp strip and lamps and lanterns |
| CN110098304B (en) * | 2019-04-29 | 2021-02-02 | 佛山市国星光电股份有限公司 | Novel light-emitting lamp bead and lamp |
| CN111477615A (en) * | 2020-04-02 | 2020-07-31 | 浙江阳光美加照明有限公司 | White light L ED light source |
| CN112745834A (en) * | 2020-12-30 | 2021-05-04 | 河北利福光电技术有限公司 | Fluorescent powder composition for reducing blue light harm and light-emitting device |
| CN113594145B (en) * | 2021-07-30 | 2024-02-13 | 中科稀土（长春）有限责任公司 | Preparation method of light source |
| CN114335292B (en) * | 2021-12-22 | 2022-12-27 | 深圳市玲涛光电科技有限公司 | High-brightness LED lamp bead and preparation method and application thereof |
| CN115595148B (en) * | 2022-11-21 | 2023-03-17 | 四川世纪和光科技发展有限公司 | Full-color bionic fluorescent composition, full-color bionic fluorescent film and full-color bionic light source |
| CN115799433B (en) * | 2023-01-09 | 2024-09-10 | 四川世纪和光科技发展有限公司 | Red light packaging structure, red light LED light source and packaging method |
| CN117568035B (en) * | 2023-12-04 | 2024-04-16 | 江门市蓬江区凯森电子厂 | High-performance fluorescent powder composition for multi-wave peak excitation LED and device |
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| US20050127833A1 (en) * | 2003-12-10 | 2005-06-16 | Tieszen Dwayne A. | White light LED and method to adjust the color output of same |
| TWI364853B (en) * | 2006-08-14 | 2012-05-21 | Fujikura Ltd | Emitting device and illuminating device |
| CN102585831B (en) * | 2012-01-19 | 2013-10-09 | 苏州大学 | Europium-ion-excited fluoromolybdate red fluorescent powder and preparation method and application thereof |
| EP3557635B1 (en) * | 2013-10-02 | 2020-05-27 | Glbtech Co. Ltd. | White light emitting device having high color rendering |
| CN105609494B (en) * | 2014-10-27 | 2019-03-01 | 光宝光电(常州)有限公司 | White light emitting device |
| CN105762144A (en) * | 2016-05-24 | 2016-07-13 | 杜军 | Full-spectrum high-color-rendering LED white light emitting device and manufacturing method thereof |
| CN106047341B (en) * | 2016-06-02 | 2019-01-22 | 北京宇极科技发展有限公司 | A kind of rare earth doping fluorescent powder, its synthetic method and its application on the led device |
| CN108091751B (en) * | 2017-12-06 | 2020-02-18 | 佛山市国星光电股份有限公司 | White light LED device, preparation method thereof and LED lamp |
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